Presbyopia, or far-sightedness, is a common condition that usually begins to affect those over the age of 40. It's one of the negative aspects of getting older, but it's good to know that having presbyopia when you already wear glasses for near sightedness doesn't mean you need to start switching between multiple pairs of glasses. Multifocal lenses, which correct both myopia and presbyopia, allow you to see well at all times, with one pair of glasses.
In the past, bifocals were the popular fix, but they have a major flaw; even though they correct problems with both near and distant objects, middle distance is blurred. In an effort to create a better product, progressive lenses were developed. These offer a transition part of the lens allowing your eyes to focus on everything between near and far distances. Let's explain how this works. Well, progressive lenses are specially curved, unlike a bifocal lens, which is sharply sectioned. For this reason, progressive lenses are also called no-line lenses. This provides not just clearer vision at near and far distances, but also nice, easy transitions between the two.
But, it can take some time to get used to these lenses. Even though the subtle lens curve results in a product that is elegant, the focal areas are relatively small because the transitional areas also take up room.
While these days, multifocal lenses (also called trifocals) are for presbyopia, bifocals are still employed to help school-aged children and teens who have other issues like eye teaming, or being unable to focus properly, which causes headaches.
Even though it may seem like an easy fix, it's best to steer clear of drug store bifocals. A lot of these ''ready-made'' glasses are one-size-fits-all, which means that the prescription is the same in both lenses and that the optical center of the lens is not customized for the wearer.
Glasses that aren't properly customized to you can lead to eye strain, discomfort and headaches. Presbyopia affects most of us at a certain age, but there are ways to make it less inconvenient. A good pair of multifocals can make a world of difference.